Stacking toy



FIG. 1 is a front-elevational view of a stacking toy showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view. 

The ornamental design for a stacking toy, as shown and described. 